Wartsila26 Engine Technology Brochure

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WÄRTSILÄ 26TECHNOLOGY REVIEW



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DESIGN PHILOSOPHY ................................................... 4

LOW NOX COMBUSTION ............................................... 5

PISTON AND PISTON RINGS ......................................... 6

CONNECTING ROD ....................................................... 6

CAMSHAFT.................................................................. 6

MAIN BEARING ............................................................ 7

CRANKSHAFT .............................................................. 7

ENGINE BLOCK AND FOUNDATION ................................ 7

CYLINDER LINER WITH ANTI-POLISHING RING ............... 8

CYLINDER HEAD .......................................................... 8

FUEL SYSTEM .............................................................. 9

FUEL INJECTION SYSTEM ............................................. 9

ENGINE-DRIVEN PUMPS ............................................... 9

AIR INTAKE AND EXHAUST SYSTEM .............................. 9

AUTOMATION SYSTEM ................................................ 9

MAINTENANCE .......................................................... 10

MAIN TECHNICAL DATA .............................................. 11

This is a brie guide to the technical eatures and advantages

o the Wärtsilä 26 engine.

TECHNOLOGY REVIEW

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DESIGN PHILOSOPHYWärtsilä engine designs are based on

generations o know-how combined with

innovations in response to customer needs.

They are also ully optimized or today’s exible

manuacturing methods.

The WÄRTSILÄ® 26 engine oers the ollowing

core values:

Easy space-saving installation•

Easy to install•

High availability•

Environmental riendliness•

Low operating costs.•

The Wärtsilä 26 was developed in response

to a need in the market or a new engine inthe 260 mm cylinder bore class. The Wärtsilä

26 represents the latest technical advances,

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Dredger Daniel Laval is equipped with two

Wärtsilä 9L26 engines.

Naval vessel De Zeven Provincien is

equipped with two Wärtsilä 16V26 engines.Dry cargo vessel Morgenstond is equipped

with a Wärtsilä 9L26 engine.

Fishing vessel Nordoytrål is equipped

with a Wärtsilä 12V26 engine.

Semi-submersible platform Thunder Horse

PDQ is equipped with a Wärtsilä 12V200

engine, two 6L20 engines, two 18V26

engines and two 18V32 LNE engines.



LOW NOX COMBUSTIONIMO NOX COMPLIANCE

Any hydrocarbon uel can be burned provided

the uel temperature is right and there is

sufcient oxygen. However, the way it is burned

has a great eect on the engine’s thermal

efciency and exhaust emissions, particularlyNOX ormation. The Wärtsilä 26 has been

developed to perorm with the optimum load

acceptance and efciency, while keeping

emission levels substantially below the

limits set by the IMO (International Maritime

Organization). The engine is delivered with

an EIAPP (Engine International Air Pollution

Prevention) Statement o Compliance as well

as a Technical File listing the parts that

inuence NOX ormation to enable correct

identifcation o these parts.

The combustion is optimized by means o a:

High compression ratio that ensures a•

higher combustion air temperature to

reduce the ignition delay, and a

High uel injection pressure or short•

injection duration, making the combustion

take place at the optimal point with respect

to efciency and reduction o NOX.

combining uel economy and low emission

rates with high uel versatility. The shortest

and lowest engine in its class, the Wärtsilä 26

requires minimum space in the engine room.

Wärtsilä works in close co-operation with

its customers when conducting feld tests andmonitoring selected test components. This has

resulted in satisfed customers: 870 engines

have been manuactured or are on order since

the new design in 1996.

With ewer parts, lower maintenance

requirements, low uel consumption, less

emissions, and the ability to run reliably

on a variety o uels, the Wärtsilä 26 is

unquestionably the state-o-the-art in marine

propulsion.

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PISTON ANDPISTON RINGSThe piston design consists o a orged

steel crown and nodular cast iron skirt with

pressurized skirt lubrication. The three-ring

pack comprises two ceramic chromium-plated

compression rings and an oil distributor ring.

This ring pack ensures optimum pressuredistribution and reduces lubricating oil

consumption. The combustion chamber

ensures efcient combustion at all loads, while

the component temperatures are kept low.

CONNECTING ROD

The connecting rod has a horizontally-split

bottom end to obtain minimal length and high

rigidity. It has only one single drilled hole,

without plugs, or the ow o lubricating oilto the piston, securing oil supply under all

circumstances without risk o leakage.

CAMSHAFT

The camshat is composed o individual single-

cylinder units with bolted ange connections to

separate journals. The anges are ormed by

cams, allowing maximum rigidity or the uel

cam loads. Valve tappets are built into modulesintegrated in the engine block, which ensures

easy maintenance and reliable operation.

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MAIN BEARINGThe geometry o the main bearing creates

an oil flm thickness which greatly exceeds

the saety margins set by the bearing

manuacturers, in accordance with the ‘Thick

Pad’ philosophy o Wärtsilä. The studs and nuts

o the bearing caps are hydraulically tensioned.

CRANKSHAFT

Special attention has been given to optimizing

the various geometrical characteristics, such

as cylinder distance, to achieve a space-saving

solution. Three-dimensional fnite-element

analysis has been used to achieve the optimal

result with maximum overall rigidity and

moderate bearing loads. All criteria o the

classifcation societies are met with large

margins. The engine can be delivered with a

100% power take-o shat at the ree end.

ENGINE BLOCK AND

FOUNDATIONThe combination o design elements such as

underslung crankshat, integral air receiver,

short cylinder distances, and material choice

has resulted in a very rigid engine block.

The camshat bearing environment

orms an integral part o the engine block,

contributing to its overall stiness and

taking the large orces caused by actuation

o the uel pumps. Bolted-on engine eet

acilitate installation in all kinds o seating

arrangements, including resilient mounting.

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CYLINDER LINER WITH ANTI-POLISHING RINGFlanged liner with tangential water ow, and

symmetrically supported at the top. Anti-

polishing ring removes the carbon rom the

top land o the piston, thereby preventing

liner polishing. This system results in a drastic

reduction o cylinder wear, lower lubricating oil

consumption and a clean piston.

CYLINDER HEADThe use o our cylinder head studs oers

easy access or maintenance, while requiring

less space. Rigidity o the cylinder head

design ensures adequate and uniorm sealing

between cylinder head and liner.

Rigidity o the ame plate prohibits

deormation o the valve seat environment. Thethick ame bottom has drilled cooling water

passages to prevent thermal stresses. Low

thermal loads and careul selection o valve and

seat material result in excellent valve reliability.

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FUEL SYSTEMFuel eed and return lines are integrated in

the uel pump housing. This results in ewer

pipe connections and thereore high reliability.

Shielded high-pressure lines and the ‘hot box’

design contribute to saety, especially in heavy

uel operation. The pressure pulses in the low-

pressure system are very low.

FUEL INJECTIONSYSTEMThe Wärtsilä 26 uel injection system achieves

the optimum uel spray pattern and droplet

size. Proper dimensioning o the camshat,

camshat bearings and rollers ensures long

lietimes and low maintenance costs.

ENGINE-DRIVENPUMPSEngine-driven lubricating oil and cooling water

pumps are an integral part o the engine.

All pumps are located on the ree end o the

engine, allowing easy connection to the ancillary

systems. Using engine-driven pumps reduces

the total investment costs or the shipowner.

AIR INTAKE AND

EXHAUST SYSTEMTurbochargers are designed or high

compression ratios and high efciencies at all

loads. The charge air receiver is designed or

minimum pressure variation and good engine

‘breathing’. The exhaust system has a ow-

optimized design. Its modular construction

ensures easy assembly.

Insulation is provided by insulating panels

which are easily removable or inspection.

The V-engine is equipped with a two-stagecharge air cooler to maximize the heat to be

recovered. The charge air cooler is housed in a

multiunctional casting which also incorporates

the turbocharger support.

AUTOMATIONSYSTEMThe engine is equipped with a scaleable

engine automation system:

The basic version (UNIC C1) consists o•

a hardwired system containing sensors,

switches and handles the basic engine

saeties.

The extended automation system (UNIC•

C2) is a complete electronic enginecontrol system including speed governing

unctions.

The two systems dier in the way signals are

handled and in the amount o unctionality

covered by the system. Both systems include

all start and stop related unctions. The

advanced control system generates alarms

and load reduction requests when set point

values are exceeded and has speed governing

unit integrated. In the basic automation systemthese unctionalities must be oreseen in the

external system.

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MAINTENANCE

The design eatures o the engine acilitate

direct access to the vital parts. This cuts the

time needed or maintenance. Other keyaspects o easy maintenance include:

Minimized number o parts by combining•

several unctionalities in the same

componenet

Hydraulic tensioning o the studs or the•

cylinder head, connecting rod and main

bearings

Automatic lubricating oil flter•

Easy removal o the cylinder head.•

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WÄRTSILÄ 26MAIN TECHNICAL DATA Cylinder bore 260 mm

Piston stroke 320 mmSpeed 900–1 000 rpmMean eective pressure 25.5–24.0 barPiston speed 9.6–10.7 m/sVoltage 0.4–13.8 kV

Alternator efciency 0.95Fuel specifcation:Fuel oil 730 cSt/50°C

7200 sR1/100°FISO 8217, category ISO-F-RMK 700

SFOC 186–192 g/kWhat ISO condition ± 5% tolerance

Rated power: Propulsion enginesOutput in kW/bhp at 900 rpm Output in kW/bhp at 1 000 rpm

Engine type kW bhp kW bhp

6L26 1 950 2 651 2 040 2 7748L26 2 600 3 535 2 720 3 6989L26 2 925 3 977 3 060 4 160

12V26 3 900 5 303 4 080 5 54716V26 5 200 7 070 5 440 7 396

Principal engine dimensions (mm) and weights (tonnes)

Engine type A* A B* B C* C

6L268L269L26

12V2616V26

4 2585 1175 5075 2186 223

4 1104 8905 2804 9685 973

1 8812 0192 0192 0742 151

1 8021 8251 8252 0742 151

1 9121 9121 9122 4532 489

1 8831 9791 9792 4532 489

D Fdry sump

Fwet sump

Weightdry sump

Weightwet sump

6L268L26

9L2612V2616V26

2 4302 430

2 4302 0602 060

818818

818800800

950950

9501 1101 110

18.422.9

24.829.233.0

16.921.0

22.731.936.5

* Turbocharger at ywheel end.

Rated power: Generating setsOutput at 900 rpm/60 Hz Output at 1000 rpm/50Hz

Engine type kW kWe kW kWe6L26 1 950 1 882 2 040 1 9698L26 2 600 2 509 2 720 2 6259L26 2 925 2 823 3 060 2 953

12V26 3 900 3 764 4 080 3 93716V26 5 200 5 018 5 440 5 250

Principal generating set dimensions (mm) and weights (tonnes)Engine type A* E* I* K L* Weight*

6L26

8L269L2612V2616V26

7 500

8 0008 5008 4009 700

2 300

2 3002 3002 7002 700

1 200

1 2001 2001 5601 560

2 430

2 4302 4302 7652 765

3 081

3 2193 2193 6343 711

40

45506070

Gen. output based on generator efciency o 96.5%.

*Dependent on generator type and size.

Main assembly shop for Wärtsilä 26 engines in Trieste, Italy.

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WÄRTSILÄ® is a registered trademark. Copyright © 2008 Wärtsilä Corporation.

Wärtsilä enhances the business o its customers by providing them

with complete liecycle power solutions. When creating better and

environmentally compatible technologies, Wärtsilä ocuses on the

marine and energy markets with products and solutions as well as

services. Through innovative products and services, Wärtsilä sets out

to be the most valued business partner o all its customers. This is

achieved by the dedication o more than 16,000 proessionals manning

150 Wärtsilä locations in 70 countries around the world. Wärtsilä is

listed on The Nordic Exchange in Helsinki, Finland.

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0 0 8 / B o c k ´ s O

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Wartsila26 Engine Technology Brochure

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